Production Limit Codes numbers which are used as a key to signify how many of certain pin has been produced. They are stamped on the back of most pins beside the words ARTISS AMINCO.

Here are the official numbers and what they mean:

• 1-Up to 1000 Pins
  
• 2-Up to 5000 pins
  
• 3-Up to 25,000 Pins
  
• 4-Over 25,000 Pins